Gold-tone sphere-case pendant watch including a dial marked Xanadu

This item is a sphere-shaped pendant watch with a gold-tone metallic finish, suspended from a matching gold-color link chain. The case features a hinged lid that opens to reveal a round watch face. The dial is white with an iridescent quality consistent with mother-of-pearl and features black Arabic numeral hour markers in a stylized typeface. The dial bears several printed markings: 'Xanadu' at the twelve o'clock position (in a script font), 'QUARTZ' above the six o'clock position, and 'JAPAN MOVT' beneath the six o'clock marker. The watch uses a three-hand movement with gold-colored hour, minute, and second hands. Condition-wise, the gold-tone finish shows visible surface scratches, minor pitting, and areas of oxidation or wear, particularly along the outer bezel and the interior of the lid. The construction and 'QUARTZ' designation are consistent with mass-produced fashion jewelry from the late 20th century. While the dial is marked 'Xanadu,' the lack of a hallmark for precious metals suggests the piece is gold-plated or base metal, and the overall attribution to a specific manufacture remains unverified without physical internal inspection.

Based on my visual examination of the provided image, I have assessed this gold-tone sphere-case pendant watch. The piece bears a mark consistent with the 'Xanadu' brand and features a dial indicating a Japanese quartz movement. From what I can see, the item appears to be mass-produced fashion jewelry likely dating from the late 20th century. The gold-tone finish shows visible surface wear, including scratching and minor oxidation, which suggests a base metal or gold-plated construction rather than solid gold. I cannot verify the specific metal content or the internal movement's functionality from a photo alone; a physical inspection by a horologist would be required to determine the caliber's condition. The value estimate of $45–$85 is based on the assumption that the 'Xanadu' attribution is correct for a vintage fashion piece of this era. This estimate reflects the general market demand for novelty 'secret' watches and orb-style pendants. Because the piece lacks precious metal hallmarks, its value is derived primarily from its aesthetic appeal and brand association. Should the item be found to have significant mechanical defects or if the 'Xanadu' marking is determined to be a later addition to a generic case, the value would likely decrease to the $10–$20 range. To confirm the nature of the materials and the legitimacy of the branding, an in-person examination, including a professional acid test for gold content and an inspection of the case back and movement stamps, would be necessary. Current market conditions for vintage quartz fashion watches remain stable, though they do not command the high premiums associated with luxury mechanical timepieces.